Phoenix Studio

Convert indexed Sigma rules into analyst-ready detections.

This studio is built around Phoenix's own rule corpus, not a blank editor. Search by title or rule id, choose a local pySigma backend, then reveal pipelines only when you actually need them.

Browse Rules Explore Ecosystem

Indexed Rules

3,731

Ready to search

Backends

Loaded from pysigma-node

pySigma Versions

Newest: 1.3.3

Translation Workspace

Shape the rule before it leaves Phoenix

Tune Translation

Active Rule

Delete Defender Scan ShellEx Context Menu Registry Key

pySigma version

Backend

Format

Target Profile

Splunk

Splunk through pysigma-backend-splunk.

Format Mode

Default

Default pySigma output mode for this backend.

Conversion Output

Delete Defender Scan ShellEx Context Menu Registry Key

Using Splunk · Default · pySigma 1.3.3

Translation controls

Adjust the rule on the left, then regenerate when you want a fresh backend-native query.

BackendSplunkFormatDefaultVersion1.3.3

title: Delete Defender Scan ShellEx Context Menu Registry Key
id: 72a0369a-2576-4aaf-bfc9-6bb24a574ac6
related:
    - id: b9e8c7d6-a5f4-4e3d-8b1a-9f0c8d7e6a5b
      type: similar
status: experimental
description: Detects deletion of registry key that adds 'Scan with Defender' option in context menu. Attackers may use this to make it harder for users to scan files that are suspicious.
references:
    - https://research.splunk.com/endpoint/395ed5fe-ad13-4366-9405-a228427bdd91/
    - https://winaero.com/how-to-delete-scan-with-windows-defender-from-context-menu-in-windows-10/
    - https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
    - https://blog.malwarebytes.com/malwarebytes-news/2021/02/lazyscripter-from-empire-to-double-rat/
author: 'Matt Anderson (Huntress)'
date: 2025-07-11
modified: 2025-10-07
tags:
    - attack.defense-evasion
logsource:
    category: registry_delete
    product: windows
detection:
    selection:
        TargetObject|contains: 'shellex\ContextMenuHandlers\EPP'
    filter_main_defender:
        Image|startswith:
            - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
            - 'C:\Program Files\Windows Defender\'
            - 'C:\Program Files (x86)\Windows Defender\'
        Image|endswith: '\MsMpEng.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unlikely as this weakens defenses and normally would not be done even if using another AV.
level: medium

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/windows/registry/registry_delete/registry_delete_defender_context_menu.yml